Die grinding



'Jan. 3, 1928.

w. R. HURD, 2D

DIE GRINDING Filed Nov. 1. 1920 2 Sheets-Sheet l 11 .1. M T 23 '20 I422! J3 //v VEN T R Jan. 3, 1928.

W. R. HURD, 2D

DIE GRINDING Filed Nov. 1, 1920 2 Sheets-Sheet 2 //\/VENTOR fifa-m ,e/ a 64 ML Patented Jan. 3, 1928.

UNITED STATES PATENT OFFICE.

WILLIAM R. HURD, 2!), OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY CORPORATION, OF PATERSGN, NEW JERSEY, A CGRPORATION OF NEW JERSEY.

DIE GRINDING.

Application .filed November This invention relates to grinding or reforming cutting edges and is herein illustrated as embodied in a device for use in the grinding of cutting dies.

Dies used in cutting out the diiferent pieces forming a shoe upper are usually made by employing a templet having the contour of the work to be produced and us ing the templet as a gage while bending a steel. ribbon to correspond to the periphery the templet. In grinding the cutting edges of these dies by hand, it is a very difficult matter to avoid a departure from the contour desired since relative overrunning between the die and the grinder is dependent entirely on the skill of the operator.

Accordingly an object of the invention is to provide for grinding accurately the edges of cutting dies without reliance on the skill of the operator in presenting the Work to the grinder.

In one aspect the invention provides a novel methodwhich, as herein exemplified, consists in utilizing a templet about which the die is curved in manufacture as a guiding means to control the grinding operation. By reason of employing the means used in determining the initial contour of the die as a means subsequently in determining a reproduced contour, a method has been devised which is economical and from the practise of which the most accurate results are ob tainable.

In another aspect-,a feature of the invention resides in the organization with a templet holder for supporting a templet in proximity to the cutting edgev of a tool, of means for moving the templet holder to provide a support for the templet in a similar position on the other side of the tool whereby the cutting edge of the tool may be used as a gage to locate the templet before it is attached. Another feature relates to a means for supporting dies of irregular shape while the templet is attached, this apparatus being so constructed that it will avoid interference with the attachment of the templet. In the illustrated construction, there is provided a frame and means for supporting dies of irregular shape on the frame, comprising a series of fingers surrounding the die and individually movable on the frame into con- 1, 1920. Serial NO. 420,911.

tact with the periphery of the die, this construction leaving the central passage through the die substantially unobstructed while the templet is located and attached.

These and other features and advantages of the invention will appear from the following specification taken in connection with an illustrative embodiment in which- Fig. l. is a top plan view of the apparatus showing particularly the positioning means for the die;

Fig. 2 is a front elevation;

Fi 3 is a similar view with the templet in another position;

Fig. at is a similar view with the templet in the position in which it is secured to the die:

5 5 is a side elevation, partly in sec- (i011 indicating the manner of using the tem plet in guiding the die for grinding;

Fig. (i is a section showing the manner of attaching the templet to the die.

The templet T is first placed in registration with the cutting edge of the die D and then transferred to the thick side of the die where it isv secured in a concentric positionto serve as a guide in grinding. To trans "the templet from a gaging position in registration with the cutting edge of the die to a similar concentric position on the thick side of the die there is provided a cross bar 10 having a central apertured boss 12 in which slides vertically a head 14 carrying a tenn let-h0lder or supporting plate 16. This holder 16 has upwardly extending locating pins 18 for registration with similarly spaced apertures in the templet. The plate 16 is mounted to move horizontally on the head 14L in order that the templet may be carried into exact registration with the cut ting edge of the die, The plate 16 is apertured at 22 for the passage of a stem 24 which extends axially through the head 14: and carries a clamp plate 20 at its upper end. The aperture 22 is enlarged at the upper side of the plate 16, as shown at 23, to receive the clamp plate 20. The aperture 22 and its enlargement 23 are of greater diameter than the stem 24: and clamp plate 20, respectively, thus enabling the plate 16 to be moved horizontally on the head 1% in order that the templet may be carried into exact registration with the cutting edge of the die. The lower end of the stem is threaded for the reception of a nut having an integral hand wheel 26 by which the clamp plate 20 may be pulled down into clamping engagement with the plate 16;

To raise and lower the head 1 1 to transfer the templet holder from one level to another, the head is provided with rack teeth 28with which engages a pinion 30 having an operating crank 32 extending toward the operator. Any suitable means such as a vertical key and co-operating lreyway may be provided to prevent rotation of the head 14-. To clamp this head in its vertically adjusted position, the following mechanism 1s utilized. .A handle 38 having. a hub is pivotallyf mounted at 4:0 to the brackets 36 on the bar 10 and a downwardly extendingarm 42 on the handle is adapted for engagement with the end of a slidingpin 44 movable in a socket 46 on the cross bar. This pin 4-4 has an inclined brake surface 4L8 at one side for engagement with the head'la and is spring pressed by the coiled spring 50 in the direction of the head. Torelease the clamp, the handle may be depressed, thereby pressing the downwardly extending arm 42 rearwardly against the end of the pin 44: to move the latter backward-1y against the tension of the spring.

In view of the fact that cutting dies vary greatly in shape and size and in order to avoid interference when securing the templet to-the die, the following securing means for the die is utilized. The bar 10 has opposite extensions and 62 forming slideways, on which are mounted slide extensions 68 and 70 formed on semi-circular plates 66 which surround the die. The slideways 62 are dovetailed as indicated at 6% for the reception of dovetailed tongues 72 formed on the slide extensions 7 0, this construction confining the semi-circular plates 66 to a rectilinear motion towards or from each other- To move the semi-circular plates toward and from each other, a right and left thread-ed screw shaft 74 is threaded in the slide extensions 70. 'This shaft extends through a lug 76 on the slideway 62 and is held against longitudinal movement by means of a collar 78 fixed to the shaft and by an operating handle 80 secured to the'end of the shaft. For securing the plates in adjusted position, a pair of lugs 82 project outwardly from the plates and clamp screws 86 having clamp plates 84 are threaded into the lugs. The clamp plates have extensions for frictional engagement beneath the slideways 60.

Each plate 66 has curved dovetailed ways 90 for the reception. of corresponding heads 92 formed on clamp screws 94: which secure to the plates a series of die holding fingers 98. These fingers 98 have slots 100 through which pass the clamp screws 94: and the wing extend far enough to interfere with the attachn'zent of the templet to the die.

As indicated in Fig. 6, the die and templet are secu ed together by angle plates 104: which are soldered as shown at 106 and 108. respectively. to the die and to the templet] In Fig. 5 shown a grinding wheel 110 and a support 112 carrying a projecting feeler 114v against which bears the peripheral edge of the templet, the templet and die being moved about acentral point with the ten'iplet against the feeler to bring all accessible parts of the die into contact with the grinding wheel. The feeler 114 is fixed in a position such that the die will contact with the grindin wheel at a point directly above the peripheryof the templet so that the die is ground to the same contour as thetemplet.

In operation, the die is first selected and supported in position by the fingers 98. 'As some dies have a very irregular shape with many re-entrant angles, it may be desirable to adjust the fingers circumferentially in their guide slots to position the fingers opposite a corner orprojecting part of the die and each finger can then be moved in a substantially radial direction to bring its reduced end 102 beneath the die. When the dies vary much in size. it may also be de- 100 sirable to move the plates 66 towards or from each other to bring the fingers to a more convenient initial position. The fin 5 ers are then clampedin position by the wing nuts This position of the die should be nearly central with respect, to, the templet holder so that the latter can be raised. through the die into the position shown in Fig.2. The templet T is then placed over the locating pins 18, where it will lie substantially in the plane of'the cutting edge of the die. 1 Now the templet, together with the holder 16, may be moved horizontally to bring the templet and die into exact registrat on The holder 16 is then clamped to the 115 head '14 by means of the hand wheel 26 and clamp plate 20. Then the templet is removedand its holder 16 lower-ed tothe position shown iii-Fig. 3 by means of the rack and pinion. The templet again placed x20 upon its holder and both are raised to the position shown in Fig. 4. where they are clamped by means of the handle 38 and its connected brake device 48. It should be noted that the concentric position of the templet is not clunged with respect to the die. although the templet is now on the thick side of the die instead of in the plane of the cutting; edge. In this position the die and templet are secured together by soldering as indicated in Fig. 6 and the die is then ready to be ground by means of the apparatus indicated in Fig. 5.

Having thus described my invention, What I claim as new and desire to secure by Letters Patent of the United States is:

1. That improvement in methods of producing a cutting edge on a curved surface which consists in utilizing a templet about which the surface is curved in manufacture as a guiding means to control cutting edge producing operations.

2. In an apparatus of the classdescribed, a support for a tool having a cutting edge at one side thereof, and means for locating a templet relatively to the cutting edge at one side of the tool and for relocating the templet in a similar position at the other side of the tool.

8. In an apparatus of the class described, a support for a tool having a cutting edge at one side thereof, a templet holder for supporting a templet in proximity to the cutting edge of the tool, and means for moving the templet holder to provide a support for the templet in a similar position at the other side of the tool.

4:. In an apparatus of the class described, a support for a die, an adjustable templet holder, and means for adjusting the templet holder to support a templet in proximity to the cutting edge of the die or in a similar position on the other side of the die.

5. In an apparatus of the class described, die holding means, a movable head, a templet holder adjustable on the head to position a templet concentrically with respect to the cutting edge of a hollow die, and means for moving the head through the die to provide support for the templet on the other side of the die in a similar concentric position.

6. In an apparatus of the class described, die holding means, a movable head, a templet holder adjustable on the head and hav ing templet holding pins, means to clamp the holder to the head with the templet concentrically placed with respect to the cutting edge of the die, and means for moving the head to provide a support for the templet on the other side of the die.

7. In an apparatus of the class described, die holding means, an adjustable head,a

templet holder adjustable on the head tolocate a templet in registration with the cutting edge of the die, and means for ad justing the head to provide a support for the templet on the other side of the die.

8. In an apparatus of the class described, die holding means, an adjustable head carrying a templet, and means including a rack and pinion for adjusting the head to provide a support for the templet on either side of the die.

9. In an apparatus of the class described, die holding means, an adjustable head carrying a templet, means for adjusting the head to provide a support for the templet on either side of the die, and means for locking the head in either position.

10. 'In an apparatus of the class described, a frame, and means for supporting and relatively positioning a die and a templet, said means comprising a templet holder adjustable relatively to the frame to locate the templet in similar positions at opposite sides of the die and a series of fingers for locating the die relatively to the templet, said fingers being individually adjustable relatively to the frame into contact with the periphery of the die to adapt them to support dies of different irregular shapes.

11. In an apparatus of the class described, a frame, and means for supporting and relatively positioning a hollow die and a templet, said means comprising a templet holder adjustable relatively to the frame to locate the templet in similar positions at opposite sides of a die, a pair of oppositely movable plates, and a series of die holding fingers mounted on the plates and having portions for engaging the outer periphery of the die and extensions for engaging the edge face at the thick end of the die.

12. In an apparatus of the class described, a frame, and means for supporting and relatively positioning a die and a templet, said means comprising a templet holder adjustable relatively to the frame to locate a templet in similar positions at opposite sides of a die, a pair of plates having curved ways, and a series of die holding fingers mounted to slide in the ways about the periphery of the die.

18. In an apparatus of the class described, means for supporting a hollow die in fixed position, a head movable through the die at right angles to the plane of the cutting edge of the die, a templet holder mounted upon the head and adapted to support a templet in parallelism to said plane and having means for locating the templet in fixed relation to the holder, said holder being adjustable relatively to the head to locate the templet concentrically with respect to the die, means for clamping the holder to the head to maintain the concentric relation of the templet and die, and means for moving the head together with the templet holder through the die in one direction into position to support the templet at the cutting edge side of the die and in the opposite di rection into position to support the templet at the opposite side of the die.

In testimony whereof I have signed my name to this specification.

WILLIAM R. HURD, 2ND. 

